A search problem in complex diagnostic Bayesian networks

  • Authors:
  • Dayou Liu;Yuxiao Huang;Qiangyuan Yu;Juan Chen;Haiyang Jia

  • Affiliations:
  • College of Computer Science and Technology, Jilin University, Changchun 130012, China and Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin Universit ...;College of Computer Science and Technology, Jilin University, Changchun 130012, China and Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin Universit ...;College of Computer Science and Technology, Jilin University, Changchun 130012, China and Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin Universit ...;College of Computer Science and Technology, Jilin University, Changchun 130012, China and Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin Universit ...;College of Computer Science and Technology, Jilin University, Changchun 130012, China and Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin Universit ...

  • Venue:
  • Knowledge-Based Systems
  • Year:
  • 2012

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Abstract

Inference in Bayesian networks (BNs) is NP-hard. We proposed the concept of a node set namely Maximum Quadruple-Constrained subset MQC(A,a-e) to improve the efficiency of exact inference in diagnostic Bayesian networks (DBNs). Here, A denotes a node set in a DBN and a-e represent five real numbers. The improvement in efficiency is achieved by computation sharing. That is, we divide inference in a DBN into the computation of eliminating MQC(A,a-e) and the subsequent computation. For certain complex DBNs and (A,a-e), the former computation covers a major part of the whole computation, and the latter one is highly efficient after sharing the former computation. Searching for MQC(A,a-e) is a combinatorial optimization problem. A backtracking-based exact algorithm Backtracking-Search (BS) was proposed, however the time complexity of BS is O(n^32^n) (n=|A|). In this article, we propose the following algorithms for searching for MQC(A,a-e) especially in complex DBNs where |A| is large. (i) A divide-and-conquer algorithm Divide-and-Conquer (DC) for dividing the problem of searching for MQC(A,a-e) into sub-problems of searching for MQC(B"1, a-e),...,MQC(B"m,a-e), where B"i@?A(1=